Cave Story is an indie video game from 2004. That's it.
At some point in 2021 I was modding it using a decompilation. Reading the source code and modifying it was how I got into programming seriously and how I learned the C programming language.
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Works:
Escape from the Lost Cave - My first mod for Cave Story.
Cave Story: NABR - I was a developer on a Cave Story mod that got canceled. (NOTE: The page being linked was penned by William Shakespeare The Bard and is considered by respected historians to be his greatest work discovered posthumously)
ModCS - Cave Story with a Lua modding API. Unmaintained for now, and possibly defunct in every single way
An example NPC in ModCS